{"id":1084,"date":"2026-09-22T03:57:32","date_gmt":"2026-09-22T03:57:32","guid":{"rendered":"https:\/\/wdlvalve.com\/?p=1084"},"modified":"2026-10-08T13:20:06","modified_gmt":"2026-10-08T13:20:06","slug":"%d8%b5%d9%85%d8%a7%d9%85%d8%a7%d8%aa-%d8%a7%d9%84%d8%ba%d8%a7%d8%b2-%d8%a7%d9%84%d8%b7%d8%a8%d9%8a%d8%b9%d9%8a-%d8%a7%d9%84%d9%85%d8%b3%d8%a7%d9%84-%d8%a7%d9%84%d9%85%d8%a8%d8%b1%d8%af%d8%a9","status":"publish","type":"post","link":"https:\/\/wdlvalve.com\/ar\/%d8%b5%d9%85%d8%a7%d9%85%d8%a7%d8%aa-%d8%a7%d9%84%d8%ba%d8%a7%d8%b2-%d8%a7%d9%84%d8%b7%d8%a8%d9%8a%d8%b9%d9%8a-%d8%a7%d9%84%d9%85%d8%b3%d8%a7%d9%84-%d8%a7%d9%84%d9%85%d8%a8%d8%b1%d8%af%d8%a9\/","title":{"rendered":"\u0635\u0645\u0627\u0645\u0627\u062a \u0627\u0644\u063a\u0627\u0632 \u0627\u0644\u0637\u0628\u064a\u0639\u064a \u0627\u0644\u0645\u0633\u0627\u0644 \u0648\u0627\u0644\u0635\u0645\u0627\u0645\u0627\u062a \u0627\u0644\u0645\u0628\u0631\u062f\u0629"},"content":{"rendered":"<article style=\"max-width: 1100px; margin: auto; padding: 20px 16px; color: #283946; font-size: 17px; line-height: 1.75;\">\n<header>\n<p style=\"margin: 0 0 24px; padding: 22px; background: #edf8fb; border-left: 5px solid #148ba6;\">LNG and cryogenic valves control liquefied natural gas and other<br \/>\nlow-temperature media in storage, transfer, vaporization and loading<br \/>\nsystems. WDL Valve supplies extended-bonnet ball, gate, globe and<br \/>\ncheck valves designed for temperatures down to -196\u00b0C.<\/p>\n<\/header>\n<p>&nbsp;<\/p>\n<section>\n<h2 style=\"margin: 38px 0 14px; color: #123f61; font-size: 28px;\">What Are LNG and Cryogenic Valves?<\/h2>\n<p>LNG and <a href=\"https:\/\/wdlvalve.com\/ar\/%d8%b4%d8%b1%d9%83%d8%a9-%d9%85%d8%b5%d9%86%d8%b9%d8%a9-%d9%84%d9%84%d8%b5%d9%85%d8%a7%d9%85%d8%a7%d8%aa-%d8%a7%d9%84%d9%85%d8%a8%d8%b1%d8%af%d8%a9\/\">cryogenic valves<\/a> are designed to isolate, regulate or<br \/>\nprevent reverse flow in piping systems carrying extremely cold<br \/>\nliquids and gases. LNG is normally stored at approximately<br \/>\n-162\u00b0C, while liquid nitrogen and some other cryogenic media may<br \/>\nrequire valve designs suitable for temperatures down to -196\u00b0C.<\/p>\n<p>At these temperatures, materials contract and some materials lose<br \/>\ntoughness. Seats, seals and packing can also change dimensions.<br \/>\nCryogenic valves therefore require suitable materials, extended<br \/>\nbonnets, controlled assembly and low-temperature testing.<\/p>\n<\/section>\n<section>\n<h2 style=\"margin: 38px 0 14px; color: #123f61; font-size: 28px;\">Where Are Cryogenic Valves Used?<\/h2>\n<p>Cryogenic valves are installed throughout LNG production, storage,<br \/>\ntransportation and distribution systems. Common installation<br \/>\nlocations include:<\/p>\n<ul style=\"padding-left: 24px;\">\n<li>LNG storage tanks and tank isolation lines<\/li>\n<li>LNG loading and unloading stations<\/li>\n<li>Marine and truck-loading systems<\/li>\n<li>LNG transfer pumps and pipelines<\/li>\n<li>Vaporizers and regasification systems<\/li>\n<li>Pressure-control and bypass lines<\/li>\n<li>Boil-off gas systems<\/li>\n<li>Emergency shutdown systems<\/li>\n<li>Liquid nitrogen, oxygen and argon systems<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2 style=\"margin: 38px 0 10px; color: #123f61; font-size: 28px;\">WDL Valve Products for Cryogenic Projects<\/h2>\n<p style=\"margin: 0 0 20px;\">The following products are selected from the existing WDL Valve<br \/>\nwebsite. Final bonnet design, materials, seats, pressure class and<br \/>\ncryogenic testing are configured according to the operating medium<br \/>\nand project specification.<\/p>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(210px,1fr)); gap: 18px; margin: 0 0 30px;\">\n<article style=\"padding: 12px; background: #fff; border: 1px solid #b8c7cf; border-radius: 5px; text-align: center;\">&nbsp;<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" style=\"display: block; width: 100%; height: auto; aspect-ratio: 1\/1; object-fit: contain; background: #fff;\" title=\"\u0635\u0645\u0627\u0645 \u0643\u0631\u0648\u064a \u0645\u0628\u0631\u062f \u0630\u0648 \u0645\u062f\u062e\u0644 \u0639\u0644\u0648\u064a\" src=\"https:\/\/wdlvalve.com\/wp-content\/uploads\/2026\/09\/DM_20260330085508_004-600x600.jpeg\" alt=\"WDL Top Entry Cryogenic Ball Valve for LNG service\" width=\"600\" height=\"600\" \/><\/p>\n<h3 style=\"margin: 13px 0 7px; color: #123f61; font-size: 19px; line-height: 1.35;\">\u0635\u0645\u0627\u0645 \u0643\u0631\u0648\u064a \u0645\u0628\u0631\u062f \u0630\u0648 \u0645\u062f\u062e\u0644 \u0639\u0644\u0648\u064a<\/h3>\n<p>&nbsp;<\/p>\n<p style=\"margin: 0; color: #52636e; font-size: 14px; line-height: 1.55;\">Extended-bonnet ball valve for LNG isolation, transfer<br \/>\nand low-temperature process systems.<\/p>\n<\/article>\n<article style=\"padding: 12px; background: #fff; border: 1px solid #b8c7cf; border-radius: 5px; text-align: center;\">&nbsp;<\/p>\n<p><img decoding=\"async\" style=\"display: block; width: 100%; height: auto; aspect-ratio: 1\/1; object-fit: contain; background: #fff;\" title=\"Stainless Steel Gate Valve\" src=\"https:\/\/wdlvalve.com\/wp-content\/uploads\/2026\/09\/DM_20250906101153_025.jpeg\" alt=\"WDL Stainless Steel Gate Valve for low-temperature projects\" width=\"600\" height=\"600\" \/><\/p>\n<h3 style=\"margin: 13px 0 7px; color: #123f61; font-size: 19px; line-height: 1.35;\">Stainless Steel Gate Valve<\/h3>\n<p>&nbsp;<\/p>\n<p style=\"margin: 0; color: #52636e; font-size: 14px; line-height: 1.55;\">Available with project-specific materials and an extended<br \/>\nbonnet for low-temperature pipeline isolation.<\/p>\n<\/article>\n<article style=\"padding: 12px; background: #fff; border: 1px solid #b8c7cf; border-radius: 5px; text-align: center;\">&nbsp;<\/p>\n<p><img decoding=\"async\" style=\"display: block; width: 100%; height: auto; aspect-ratio: 1\/1; object-fit: contain; background: #fff;\" title=\"CF8 Stainless Steel Globe Valve\" src=\"https:\/\/wdlvalve.com\/wp-content\/uploads\/2026\/09\/DM_20260914094406_001-600x600.jpg.webp\" alt=\"WDL CF8 Stainless Steel Globe Valve\" width=\"600\" height=\"600\" \/><\/p>\n<h3 style=\"margin: 13px 0 7px; color: #123f61; font-size: 19px; line-height: 1.35;\">CF8 Stainless Steel Globe Valve<\/h3>\n<p>&nbsp;<\/p>\n<p style=\"margin: 0; color: #52636e; font-size: 14px; line-height: 1.55;\">Globe valve for isolation and flow regulation. Cryogenic<br \/>\nconstruction is supplied to project requirements.<\/p>\n<\/article>\n<\/div>\n<aside style=\"margin: 0 0 28px; padding: 16px 18px; background: #fff8e6; border-left: 5px solid #dfa51f; font-size: 15px;\"><strong>Product note:<\/strong><br \/>\nThe stainless steel gate, globe and check valves shown above are<br \/>\nexisting WDL Valve products. Their suitability for LNG service<br \/>\ndepends on the specified bonnet extension, minimum temperature,<br \/>\nseat construction, materials and cryogenic testing.<\/aside>\n<\/section>\n<section>\n<h2 style=\"margin: 38px 0 14px; color: #123f61; font-size: 28px;\">Which Cryogenic Valve Type Should Be Selected?<\/h2>\n<div style=\"width: 100%; overflow-x: auto; margin: 20px 0 28px; border: 2px solid #344955; -webkit-overflow-scrolling: touch;\" tabindex=\"0\" role=\"region\" aria-label=\"Cryogenic valve type selection\">\n<table style=\"width: 100%; min-width: 760px; margin: 0; border-collapse: collapse; background: #fff;\">\n<thead>\n<tr>\n<th style=\"padding: 13px; border: 1px solid #344955; background: #123f61; color: #fff; text-align: left;\">\u0646\u0648\u0639 \u0627\u0644\u0635\u0645\u0627\u0645<\/th>\n<th style=\"padding: 13px; border: 1px solid #344955; background: #123f61; color: #fff; text-align: left;\">Main Function<\/th>\n<th style=\"padding: 13px; border: 1px solid #344955; background: #123f61; color: #fff; text-align: left;\">Typical Application<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Cryogenic ball valve<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Fast operation and tight isolation<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">LNG transfer, loading and emergency isolation<\/td>\n<\/tr>\n<tr style=\"background: #edf5f8;\">\n<td style=\"padding: 13px; border: 1px solid #344955;\">Cryogenic gate valve<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Full-open or full-closed isolation<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Storage tanks and LNG transfer pipelines<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Cryogenic globe valve<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Flow regulation and isolation<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Vaporization, bypass and pressure-control lines<\/td>\n<\/tr>\n<tr style=\"background: #edf5f8;\">\n<td style=\"padding: 13px; border: 1px solid #344955;\">Cryogenic check valve<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Automatic reverse-flow prevention<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Pump outlets and LNG transfer systems<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n<section>\n<h2 style=\"margin: 38px 0 14px; color: #123f61; font-size: 28px;\">Why Do Cryogenic Valves Use an Extended Bonnet?<\/h2>\n<p>An extended bonnet increases the distance between the cryogenic<br \/>\nmedium and the stem packing. It reduces heat transfer and helps<br \/>\nkeep the packing area at a temperature where the sealing materials<br \/>\ncan continue to operate.<\/p>\n<p>The extension also allows a vapor space to form above the liquid.<br \/>\nThis protects the stem seal from direct contact with the cryogenic<br \/>\nliquid and reduces the risk of external leakage.<\/p>\n<p>Bonnet length and installation direction should follow the valve<br \/>\ndesign and project requirements. In many cryogenic applications,<br \/>\nthe stem must be installed in an approved upright position so the<br \/>\npacking remains above the liquid level.<\/p>\n<\/section>\n<section>\n<h2 style=\"margin: 38px 0 14px; color: #123f61; font-size: 28px;\">Materials for LNG and Cryogenic Valves<\/h2>\n<p>Austenitic stainless steels are commonly used for cryogenic valves<br \/>\nbecause they retain useful toughness at very low temperatures.<br \/>\nSuitable grades may be selected for the body, bonnet, closure<br \/>\nmember, stem and internal trim.<\/p>\n<p>All pressure-containing and wetted components must be checked for<br \/>\nthe minimum design temperature. Body materials alone do not<br \/>\ndetermine cryogenic suitability. Bolting, packing, gaskets, seats<br \/>\nand welding materials also need to remain suitable after thermal<br \/>\ncontraction.<\/p>\n<p>Material certificates, impact testing and other inspection<br \/>\nrequirements should be stated in the purchase specification when<br \/>\nrequired by the project.<\/p>\n<\/section>\n<section>\n<h2 style=\"margin: 38px 0 14px; color: #123f61; font-size: 28px;\">Soft-Seated or Metal-Seated Cryogenic Valve?<\/h2>\n<p>Soft-seated cryogenic valves may provide very tight shutoff when<br \/>\nthe seat material is compatible with the medium, pressure and<br \/>\nminimum temperature. Seat design must allow for dimensional changes<br \/>\nduring cooling and warming.<\/p>\n<p>Metal-seated valves may be selected when the project requires<br \/>\nfire-safe construction, greater resistance to wear or operation<br \/>\noutside the limits of a soft-seat material. The required leakage<br \/>\nacceptance criteria should always be specified.<\/p>\n<\/section>\n<section>\n<h2 style=\"margin: 38px 0 14px; color: #123f61; font-size: 28px;\">Cryogenic Valve Testing<\/h2>\n<p>Cryogenic testing verifies that the valve can operate and maintain<br \/>\nacceptable leakage performance at the specified low temperature.<br \/>\nThe test may include cooling, pressure stabilization, operating<br \/>\ncycles, seat-leakage inspection and external-leakage inspection.<\/p>\n<p>The purchaser should specify the test temperature, test medium,<br \/>\npressure, holding time, number of operating cycles and leakage<br \/>\nacceptance criteria. Testing requirements may differ between LNG,<br \/>\nliquid nitrogen, liquid oxygen and other cryogenic services.<\/p>\n<aside style=\"margin: 24px 0; padding: 18px 20px; background: #fff8e6; border-left: 5px solid #dfa51f;\"><strong>\u0647\u0627\u0645:<\/strong><br \/>\nA standard stainless steel valve should not be considered suitable<br \/>\nfor LNG service based only on its body material. Bonnet design,<br \/>\nstem sealing, seat construction, assembly procedure and cryogenic<br \/>\ntesting must also be reviewed.<\/aside>\n<\/section>\n<section>\n<h2 style=\"margin: 38px 0 14px; color: #123f61; font-size: 28px;\">How to Select an LNG and Cryogenic Valve<\/h2>\n<ul style=\"padding-left: 24px;\">\n<li>Confirm the cryogenic medium and minimum operating temperature.<\/li>\n<li>Provide the valve size, pressure class and end connection.<\/li>\n<li>State the design pressure and normal operating pressure.<\/li>\n<li>Select compatible body, trim, seat, packing and gasket materials.<\/li>\n<li>Define the required shutoff and leakage performance.<\/li>\n<li>Confirm extended-bonnet and installation requirements.<\/li>\n<li>State fire-safe and antistatic requirements where applicable.<\/li>\n<li>Provide the required cryogenic test procedure and acceptance criteria.<\/li>\n<li>Select manual, pneumatic, electric or hydraulic actuation.<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2 style=\"margin: 38px 0 14px; color: #123f61; font-size: 28px;\">Information Required for a Cryogenic Valve Quotation<\/h2>\n<div style=\"width: 100%; overflow-x: auto; margin: 20px 0 28px; border: 2px solid #344955; -webkit-overflow-scrolling: touch;\" tabindex=\"0\" role=\"region\" aria-label=\"Cryogenic valve quotation information\">\n<table style=\"width: 100%; min-width: 700px; margin: 0; border-collapse: collapse; background: #fff;\">\n<thead>\n<tr>\n<th style=\"padding: 13px; border: 1px solid #344955; background: #123f61; color: #fff; text-align: left;\">Required Information<\/th>\n<th style=\"padding: 13px; border: 1px solid #344955; background: #123f61; color: #fff; text-align: left;\">Details to Provide<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Valve<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Type, size, quantity and pressure class<\/td>\n<\/tr>\n<tr style=\"background: #edf5f8;\">\n<td style=\"padding: 13px; border: 1px solid #344955;\">Medium<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">LNG, nitrogen, oxygen, argon or other fluid<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Conditions<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Minimum temperature and design pressure<\/td>\n<\/tr>\n<tr style=\"background: #edf5f8;\">\n<td style=\"padding: 13px; border: 1px solid #344955;\">\u0627\u0644\u0645\u0648\u0627\u062f<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Body, bonnet, stem, trim, seat and seals<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 13px; border: 1px solid #344955;\">\u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Manual, pneumatic, electric or hydraulic<\/td>\n<\/tr>\n<tr style=\"background: #edf5f8;\">\n<td style=\"padding: 13px; border: 1px solid #344955;\">\u0627\u0644\u0627\u062e\u062a\u0628\u0627\u0631<\/td>\n<td style=\"padding: 13px; border: 1px solid #344955;\">Cryogenic test temperature and leakage requirements<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n<section>\n<h2 style=\"margin: 38px 0 14px; color: #123f61; font-size: 28px;\">\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/h2>\n<h3 style=\"margin: 22px 0 8px; color: #123f61; font-size: 21px;\">What temperature can an LNG valve handle?<\/h3>\n<p>LNG valves may be designed for temperatures around -162\u00b0C. Valves<br \/>\nfor liquid nitrogen and other cryogenic media may require a minimum<br \/>\ndesign temperature down to -196\u00b0C. The specified temperature must<br \/>\nmatch the actual medium and project conditions.<\/p>\n<h3 style=\"margin: 22px 0 8px; color: #123f61; font-size: 21px;\">Why is an extended bonnet required?<\/h3>\n<p>An extended bonnet separates the stem packing from the cryogenic<br \/>\nliquid. It reduces heat transfer and helps the packing retain its<br \/>\nsealing performance.<\/p>\n<h3 style=\"margin: 22px 0 8px; color: #123f61; font-size: 21px;\">Can cryogenic valves be automated?<\/h3>\n<p>Cryogenic ball, gate and globe valves can use pneumatic, electric<br \/>\nor hydraulic actuators. Actuator selection should consider valve<br \/>\ntorque, differential pressure, operating time and fail-safe action.<\/p>\n<h3 style=\"margin: 22px 0 8px; color: #123f61; font-size: 21px;\">Do cryogenic valves require special testing?<\/h3>\n<p>Cryogenic valves may require low-temperature testing to verify<br \/>\noperating performance, seat leakage and external leakage. The test<br \/>\nprocedure and acceptance criteria should be included in the project<br \/>\nspecification.<\/p>\n<h3 style=\"margin: 22px 0 8px; color: #123f61; font-size: 21px;\">Are stainless steel valves suitable for LNG?<\/h3>\n<p>Suitable austenitic stainless steels are commonly used for LNG<br \/>\nvalves, but body material alone is not enough. The valve also needs<br \/>\nsuitable trim, seats, packing, bonnet design and cryogenic testing.<\/p>\n<\/section>\n<p>&nbsp;<\/p>\n<aside style=\"margin-top: 36px; padding: 20px 22px; background: #eef5f8; border: 1px solid #b8c7cf; border-radius: 5px;\"><strong style=\"display: block; margin-bottom: 6px; color: #123f61; font-size: 19px;\">About the Author<br \/>\n<\/strong><\/p>\n<p style=\"margin: 0;\"><strong>wong wp<\/strong> works with WDL Valve on industrial valve<br \/>\nselection and international project support, including cryogenic,<br \/>\ncorrosion-resistant and high-pressure valve applications.<\/p>\n<\/aside>\n<section style=\"margin-top: 38px; padding: 28px 22px; background: #123f61; color: #fff; text-align: center; border-radius: 6px;\">\n<h2 style=\"margin: 0 0 12px; color: #fff; font-size: 28px;\">Discuss Your LNG Valve Application<\/h2>\n<p style=\"max-width: 760px; margin: 0 auto 20px;\">Send WDL Valve your medium, minimum temperature, pressure class,<br \/>\nmaterials and testing requirements for technical review and quotation. Review our <a href=\"https:\/\/wdlvalve.com\/ar\/%d8%b4%d8%b1%d9%83%d8%a9-%d9%85%d8%b5%d9%86%d8%b9%d8%a9-%d9%84%d9%84%d8%b5%d9%85%d8%a7%d9%85%d8%a7%d8%aa-%d8%a7%d9%84%d9%83%d8%b1%d9%88%d9%8a%d8%a9-%d8%a7%d9%84%d9%85%d8%a8%d8%b1%d8%af%d8%a9\/\">\u0634\u0631\u0643\u0629 \u0645\u0635\u0646\u0639\u0629 \u0644\u0644\u0635\u0645\u0627\u0645\u0627\u062a \u0627\u0644\u0643\u0631\u0648\u064a\u0629 \u0627\u0644\u0645\u0628\u0631\u062f\u0629<\/a> page for top-entry and side-entry options.<\/p>\n<p><a style=\"display: inline-block; padding: 12px 24px; background: #fff; color: #123f61; border-radius: 4px; font-weight: bold; text-decoration: none;\" href=\"https:\/\/wdlvalve.com\/ar\/%d8%a7%d8%aa%d8%b5%d9%84-%d8%a8%d9%86%d8%a7\/\">Discuss This Application<br \/>\n<\/a><\/p>\n<\/section>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>\u062a\u064f\u0633\u062a\u062e\u062f\u0645 \u0635\u0645\u0627\u0645\u0627\u062a \u0627\u0644\u063a\u0627\u0632 \u0627\u0644\u0637\u0628\u064a\u0639\u064a \u0627\u0644\u0645\u0633\u0627\u0644 (LNG) \u0648\u0627\u0644\u0635\u0645\u0627\u0645\u0627\u062a \u0627\u0644\u0645\u0628\u0631\u062f\u0629 \u0644\u0644\u062a\u062d\u0643\u0645 \u0641\u064a \u0627\u0644\u063a\u0627\u0632 \u0627\u0644\u0637\u0628\u064a\u0639\u064a \u0627\u0644\u0645\u0633\u0627\u0644 \u0648\u0627\u0644\u0645\u0648\u0627\u062f \u0627\u0644\u0623\u062e\u0631\u0649 \u0630\u0627\u062a \u062f\u0631\u062c\u0627\u062a \u0627\u0644\u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u0645\u0646\u062e\u0641\u0636\u0629 \u0641\u064a \u0623\u0646\u0638\u0645\u0629 \u0627\u0644\u062a\u062e\u0632\u064a\u0646 \u0648\u0627\u0644\u0646\u0642\u0644 \u0648\u0627\u0644\u062a\u0628\u062e\u064a\u0631 \u0648\u0627\u0644\u062a\u062d\u0645\u064a\u0644. \u062a\u0648\u0641\u0631 \u0634\u0631\u0643\u0629 WDL Valve \u0635\u0645\u0627\u0645\u0627\u062a \u0643\u0631\u0648\u064a\u0629 \u0648\u0635\u0645\u0627\u0645\u0627\u062a \u0628\u0648\u0627\u0628\u0629 \u0648\u0635\u0645\u0627\u0645\u0627\u062a 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